Electric clock.



U. H. WHITE. ELECTRIC 0LO0K.

' APPLIOATIOR FILED APR. 24,1907.

Payented 0ct. 13, 1908.

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INZENTOR.

BY Y I @fii? ATTORNEY WITNESSES.-

G. H. WHITE.

ELECTRIC CLOCK.

APPLICATION FILED An. 24,1907.

Patented Oct-13,1908.

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C. H. WHITE.

- ELECTRIC CLOCK; APPLICATION nun APR. 24,1907. I

901 ,050. Patented Oct. 13, 1908. s SHEETS-SHEET a,

PATENT QFFICE,

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. ELECTRIC. CLOCK.

To all whom it may concern: Be it known that-L'CIrAR'Lns '11. WHITE, of

SparrowsPoint, in the county of Baltimore and State of Maryland, have invented certain Improvements in Electric Clocks, of which the following is a specification.

' This invention relatesto certain improvements in that class of electric clocks in which the time movement is-driven by a descending weighted lever, the said lever being raised at intervals'by electromagnets and an armature.

In the further description of the said invention which follows, reference is made to the accompanying drawings forming a part hereof, andin whi'ch,

Figure 1 is a front'view of such partsof the clock-movement as are involved in the pres- 'ent invention. Fig. 2 is an enlarged front 1 view of certain parts of the movement shown in Flg. 1.

Fig. 3, is a view-"of certain parts of V Fig; 2, looking in the direction indicated by the .arrow; Fig. 4 represents two still enlargedviews of an adjustable pin employed to communicate motion to a part of the clock movement, as hereinafter described. Fig. 5 is anenlarged erspective view of certain parts of the 0100 r movement.

Referring now to the drawings, 1 is the back or rear plate of'?the clock movement and 2 the iininute arbor tofwhich is fastened the first gear wheel 3of the "train of gearing com rised in the movement. The wheel 3 mes res with a pinion 4 on the arbor 5. The pins serving as teeth of the pinion 4 and those of another similar pinion hereinafter referred'to, are shown dotted in Fig. 1. The arbor 5 carries the second gear wheel 7 and this wheel meshes with a pinion 9 on the escapement arbor 10. The escapement wheel is denotedby 12 and the anchor by 13.

All the parts of the clock movement thus far described, are commori to clocks; and in order to avoid complication in the drawings, the remaining gearing which is embraced in a non-electric clock movement is omitted.

15 is a rocker placed loosely on the minute arbor, having a shank a to which an armature 17 is fastened. The said rocker is also provided with an arm I) which carries a spring-heldpawl 19 the point of which rests 1 on the teeth of a ratchet wheel 20 fastened to the minute arbor 2. '1' f 21. is a rod shown as fastened to the rocker 15, having an adjustable weight 22 at its end,

which as it descends, furnishes the power neoi Specification of Letters Patent. I Application filed April 24, 1907. Serial No. 369,928.

Patented Oct. 13, 1908.

essary to effect the action of the clock move- Inent. T

24 is a cam hung loosely on the minute arbor 2, with its active edge resting on a spring-held lever .25 fastened to a spindle 27 plates only one of which is shown.

The shank c of the cam 24 is situated between the pins A and B projecting from the enlargement (Z of the arm 5. These pins are formed on the face of screws C oneof which is shown on an enlarged scale in Fig. 4; and they are. placed eccentrically with. respect tothe axis of the screws, as is well shown in that figure. The ins are sospaced that the rocker 15 and its attachments will have considerable vibratory movement independent of the cam 24; and the object of placing the pins to one side of the axis of the screws, is to admit of the independent movement of the cam, being increased or diminished as required, the change in space between the pins being effected by turning the screws, as/w'ill be readily understood.

centric with the surface of the minute arbor 2, and these surfaces are connected by the practically straight tangential surface which forms a shoulder and the lever 25 is pro vided with a notch 7t in which the curved surfaceh of the cam will rest when the cam is in the position shown in Fig.

29 is a plate of hard material such for in stance as steel, which forms the abrupt edge of the notch 7.: to reduce wear at that point, in the operation of the clock as hereinafter described.

30,- 30 are electro-magnets in an electric circuit comprising wires 92, o, p, the lever25, and the insulated s )lit contact plate 31. This circuit is open when the free end of the arm 25 is disconnected from the contact plate}, as shown in Fig. and by the dotted delineations of the said. arm in Fig. 2. The

is not shown.

By reference to Fig. 2 it will be seen that the ends of the cores (1 of the magnets are concentric with the minute arbor. conse quently there is a" common i-listance between the cores and the armature during the swingto which it is sul'ijeetcd in the operation of the clock.

The active surface or edge of the cam is formed of two portions h and 'L which are coning or vibratory movement of the armature It will be understood that the downward the pintles of which are loose in the clock battery whereby the magnets are energized .a' point it would reach by a gra ual movement of the weighted rod 21 effects the operation of the clock, the spring pawl. 1-9 causing the rotation of the ratchet wheel 20 which is fast to the minute arbor 2 In Fig. 1 the various parts of the clock movement are shown in the positions which they occupy when the weighted rod 21 had nearly reached its lowest position and is about to become an inoperative'device. In the further motion of the arm I) of the rocker -15- consequent upon the fall which is in contact with the edge of the cam,- carries its shoulder into it enters allows the end, of the lever 25 to make electric contact with the split plate 31. This contact of the lever 25 with the split plate 31 closes the electric circuit, and by the armature 17 being drawn down into the'lposition shown by its dotted delineation in ig 2, the weighted rod 21 is instantly lifted to its highest position shown by the dotted lines in the same figure, the pawl clicking on the teeth of the ratchet wheel. This movejrne'nt. of the weighted'rod as described is so rapidly performed, that the momentum of the weig t causes that'device to ass beyond upward movement.

At the beginning of the upward movement of the weighted rod 21, the portion hof the cam 24 is fully within the slot k, and the contact of the lever 25 with the split-plate 31,

. com lete,'as shown in full lines in Fig. 2; and as t e pin A stands a proper distance from the edge of the shank c of the cam 24, the said weighted rod continues to ascend under the influence of the magnet, until the armature 17 is directly over or in alinement with the cores of the magnets as shown by the dotted lines in Fig. 2. The pin A then strikes the cam shank and the momentum of theweight 22 throws the shoulder '9' over the edge of the slot is, when the surface h'will ride on the upper edge of the lever 25 which is forced from contact with the split plate 31 as shownby the dotted lines in Fig. 2 and in full hnes in. Fig. 5. The electric circuit now being open, the

' weighted of the weighted rod, the pin B the slot 7c which as having lever descends from its elevated position shown i'rI'Fig. '5 and effects the operation of the clock, until it approaches its first position, when the pin B throws the cam to its original position shown in full lines in Fig. 2, and the weighted rodagain ascends, and the operation described is repeated.

I claim as my invention: 1. In an electric clock, the minute arbor thereof provided witha tight ratchet wheel,

a' jrocker' which is loose' on the arbor having afiextended weighted arm and cariging a pawlwhich engages with the teeth 0 the ratchet wheel together with ashank bearing an armature-,---a cam suspended loosely from thearbor, an independent spring-held lever having-a notch therei to receive the cam,

means to communicate motion from the rocker to the cam and thereby in the vibraof the rocker, throw the can-1 into and out of the said notch, combined tory motion with a magnet and a contact plate for the notche'dlever, the said magnet notched lever and contact late being in an electric circuit, substantia ly as specified.

2. In an electric clock, the minute arbor thereof provided with a tight ratchet wheel, a rocker which is loose on the arbor having an extended weighted. arm and carrying a pawl which engages with the teeth of the ratchet wheel together with a shank bearing an armature, a cam suspended loosely from the arbor, an independent spring-held lever a notch therein to receive the cam, spaced pins on the .rocker to communicate motion from the rocker to the cam and therebyin the vibratory motion of the rocker,

throw the cam into and out of the said notch,

combined with a magnet and' a contact plate for the notched lever, the said magnet notched lever and contact plate being in an electric circuit, substantial y as specified.

. CHARLES 11'. WHITE.

Witnesses:

THOMAS G. HULL, WM. '1. HOWARD. 

